package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;


@Service
@Slf4j
public class UserServiceImpl implements UserService {
    private static final String WX_url="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;


  /**
   * 微信登陆
   * @param userLoginDTO
   * @return
   * */
    public User WeChatLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空，若为空，抛出异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断数据库中是否存在该用户，若不存在，注册新用户
        User user = userMapper.getByOpenid(openid);
        if(user==null){
            //自动注册
          user=User.builder()
                  .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
          userMapper.insert(user);
        }
        return user;
    }
    /**
     * 调用微信接口服务，获取微信服务的openid
     * @param code
     * @return
     * */
    private String getOpenid(String code){
        HashMap<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_url, map);
        //将json转格式
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
